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If a drop of water falls on a very hot i...

If a drop of water falls on a very hot iron, it takes long time to evaporate. Explain why?

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When a drop of water falls on a very hot iron it gets insulated from the hot iron due to a thin layer of water vapour which is a bad conductor of heat. It takes quite long to evaporate as heat is conducted from hot iron to the drop through the insulating layer of water vapour very slowly.
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